Nakamoto refused to say any more, and the police made it clear our conversation was over.

But a two-month investigation and interviews with those closest to Nakamoto and the developers who worked most frequently with him on the out-of-nowhere global phenomenon that is Bitcoin reveal the myths surrounding the world's most famous crypto-currency are largely just that - myths - and the facts are much stranger than the well-established fiction.

Two weeks before our meeting in Temple City, I struck up an email correspondence with Satoshi Nakamoto, mostly discussing his interest in upgrading and modifying model steam trains with computer-aided design technologies. I obtained Nakamoto's email through a company he buys model trains from.

He has been buying train parts from Japan and England since he was a teenager, saying, "I do machining myself, manual lathe, mill, surface grinders."

After that, Nakamoto disregarded my requests to speak by phone and did not return calls. The day I arrived at his modest, single-family home in southern California, his silver Toyota Corolla CE was parked in the driveway but he didn't answer the door.

At one point he did peer out, cracking open the door screen and making eye contact briefly. Then he shut it. That was the only time I saw him without police officers in attendance.

Bitcoin is a currency that lives in the world of computer code and can be sent anywhere in the world without racking up bank or exchange fees, and is then stored on a cellphone or hard drive until used again. Because the currency resides in code, it can also be lost when a hard drive crashes, or stolen if someone else accesses the keys to the code.

"The whole reason geeks get excited about Bitcoin is that it is the most efficient way to do financial transactions," says Bitcoin's chief scientist, Gavin Andresen, 47. He acknowledges that Bitcoin's ease of use can also lead to easy theft and that it is safest when stored in a safe-deposit box or on a hard drive that's not connected to the Internet. "For anyone who's tried to wire money overseas, you can see how much easier an international Bitcoin transaction is. It's just as easy as sending an email."

The currency has attracted the attention of the U.S. Senate, the Department of Homeland Security, the Federal Reserve, the Internal Revenue Service, the Treasury Department's Financial Crimes Enforcement Network, the Securities and Exchange Commission and the Federal Bureau of Investigation, which in October shuttered the online black market Silk Road and seized its $3.5 million cache of Bitcoin. "The FBI is now one of the largest holders of Bitcoin in the world," Andresen says.

In recent weeks, a revived version of Silk Road as well as one of Bitcoin's biggest exchanges, Tokyo-based Mt. Gox, shut down and filed for bankruptcy after attacks by hackers drained each of millions of dollars.

Andresen, a Silicon Valley refugee in Amherst, Mass., says he worked closely with the person "or entity" known as Satoshi Nakamoto on the development of Bitcoin from June 2010 to April 2011. This was before the rise of today's multibillion-dollar Bitcoin economy, boosted last year by the unexpected, if cautious, endorsement of outgoing Federal Reserve chair Ben Bernanke, who said virtual currencies "may hold long-term promise."

"Working on Bitcoin's core code is really scary, actually, because if you wreck something, you can break this huge $8 billion project," says Andresen. "And that's happened. We have broken it in the past."

For nearly a year, Andresen corresponded with the founder of Bitcoin a few times a week, often putting in 40-hour weeks refining the Bitcoin code. Throughout their correspondence, Nakamoto's evasiveness was his hallmark, Andresen says.

In fact, he never even heard Nakamoto's voice, because the founder of Bitcoin would not communicate by phone. Their interactions, he says, always took place by "email or private message on the Bitcointalk forum," where enthusiasts meet online.

Andresen, an Australian who graduated from Princeton with a Bachelor's in computer science, eventually became Nakamoto's point person on a growing team of international coders and programmers who worked on a volunteer basis to perfect the Bitcoin code after its inauspicious launch in January 2009.

Andresen originally heard about Bitcoin the following year through a blog he followed. He reached out to Nakamoto through one of the Bitcoin founder's untraceable email addresses and offered his assistance. His initial message to Bitcoin's inventor read: "Bitcoin is a brilliant idea, and I want to help. What do you need?"

Andresen says he didn't give much thought to working for an anonymous inventor. "I am a geek," he says simply. "I don't care if the idea came from a good person or an evil person. Ideas stand on their own."

Other developers were driven by "enlightened self-interest," profit or personal politics, he says. But nearly all were intrigued by the promise of a digital currency accessible to anyone in the world that could bypass central banks at a time when the global financial system was on life support. In this respect, the launch of Bitcoin could not have been better timed.

The paper proposed "electronic cash" that "would allow online payments to be sent directly from one party to another without going through a financial institution," with transactions time-stamped and viewable to all.

The masterstroke was replacing the role of banks as the trusted middlemen with Bitcoin users, who would act as sentinels for the integrity of the system, verifying transactions using their computing power in exchange for Bitcoin.

Bitcoin production is designed to move at a carefully calibrated pace to boost value and scarcity and remain inflation proof, halving its quantity every four years, and is designed to stop proliferating when Bitcoins reach a total of 21 million in 2140. (Bitcoins can be divided by up to eight decimal places, with the smallest units called "satoshis.")

"I got the impression that Satoshi was really doing it for political reasons," says Andresen, who gets paid in Bitcoins - along with a half-dozen other Bitcoin core developers working everywhere from Silicon Valley to Switzerland - by the Bitcoin Foundation, a nonprofit working to standardize the currency.

He doesn't like the system we have today and wanted a different one that would be more equal. He did not like the notion of banks and bankers getting wealthy just because they hold the keys," says Andresen.

Holding the keys has also made early comers to Bitcoin wealthy beyond measure. "I made a small investment in Bitcoin and it is actually enough that I could now retire if I wanted to," Andresen says. "Overall, I've made about $800 per penny I've invested. It's insane."

One of the first people to start working with Bitcoin's founder in 2009 was Martti Malmi, 25, a Helsinki programmer who invested in Bitcoins. "I sold them in 2011 and bought a nice apartment," he says. "Today, I could have bought 100 nice apartments."

Communication with Bitcoin's founder was becoming less frequent by early 2011. Nakamoto stopped posting changes to the Bitcoin code and ignored conversations on the Bitcoin forum.

Andresen was unprepared, however, for Satoshi Nakamoto's reaction to an email exchange between them on April 26, 2011.

"I wish you wouldn't keep talking about me as a mysterious shadowy figure," Nakamoto wrote to Andresen. "The press just turns that into a pirate currency angle. Maybe instead make it about the open source project and give more credit to your dev contributors; it helps motivate them."

Then he told Nakamoto he'd accepted an invitation to speak at the Central Intelligence Agency headquarters. "I hope that by talking directly to them and, more importantly, listening to their questions/concerns, they will think of Bitcoin the way I do - as a just-plain-better, more efficient, less-subject-to-political-whims money," he said. "Not as an all-powerful black-market tool that will be used by anarchists to overthrow the System."

From that moment, Satoshi Nakamoto stopped responding to emails and dropped off the map.

For the past 40 years, Satoshi Nakamoto has not used his birth name in his daily life. At the age of 23, after graduating from California State Polytechnic University, he changed his name to "Dorian Prentice Satoshi Nakamoto," according to records filed with the U.S. District Court of Los Angeles in 1973. Since then, he has not used the name Satoshi but instead signs his name "Dorian S. Nakamoto."

Descended from Samurai and the son of a Buddhist priest, Nakamoto was born in July 1949 in the city of Beppu, Japan, where he was brought up poor in the Buddhist tradition by his mother, Akiko. In 1959, after a divorce and remarriage, she immigrated to California, taking her three sons with her. Now age 93, she lives with Nakamoto in Temple City.

Nakamoto did not get along with his stepfather, but his aptitude for math and science was evident from an early age, says Arthur, who also notes, "He is fickle and has very weird hobbies."

Just after graduating college, Nakamoto went to work on defense and electronics communications for Hughes Aircraft in southern California. "That was just the beginning," says Arthur, who also worked at Hughes. "He is the only person I have ever known to show up for a job interview and tell the interviewer he's an idiot - and then prove it."

Nakamoto has six children. The first, a son from his first marriage in the 1980's, is Eric Nakamoto, an animation and 3-D graphics designer in Philadelphia. His next five children were with his second wife, Grace Mitchell, 56, who lives in Audubon, N.J., and says she met Nakamoto at a Unitarian church mixer in Cherry Hill, N.J., in the mid-1980s. She recalls he came to the East Coast after leaving Hughes Aircraft, now part of Raytheon, in his 20s and next worked for Radio Corporation of America in Camden, N.J., as a systems engineer.

"We were doing defensive electronics and communications for the military, government aircraft and warships, but it was classified and I can't really talk about it," confirms David Micha, president of the company now called L-3 Communications.

Mitchell says her husband "did not talk much about his work" and sometimes took on military projects independent of RCA. In 1987, the couple moved back to California, where Nakamoto worked as a computer engineer for communications and technologies companies in the Los Angeles area, including financial information service Quotron Systems Inc., sold in 1994 to Reuters, and Nortel Networks.

Nakamoto, who was laid off twice in the 1990s, according to Mitchell, fell behind on mortgage payments and taxes and their home was foreclosed. That experience, says Nakamoto's oldest daughter, Ilene Mitchell, 26, may have informed her father's attitude toward banks and the government.

She also describes her father as a man who worked all hours, from before the family rose in the morning to late into the night. "He would keep his office locked and we would get into trouble if we touched his computer," she recalls. "He was always expounding on politics and current events. He loved new and old technology. He built his own computers and was very proud of them."

When the FAA contract ended, Nakamoto moved back to Temple City, where for the rest of that decade things get hazy about what kind of work he undertook.

Ever since Bitcoin rose to prominence there has been a hunt for the real Satoshi Nakamoto. Did he act alone or was he working for the government? Bitcoin has been linked to everything from the National Security Agency to the International Monetary Fund.

Yet, in a world where almost every big Silicon Valley innovation seems to erupt in lawsuits over who thought of it first, in the case of Bitcoin the founder has remained conspicuously silent for the past five years.

"I could see my dad doing something brilliant and not accepting the greater effect of it," says Ilene Mitchell, who works for Partnerships for Student Achievement in Beaverton, Ore. "But I honestly don't see him being straight about it. Any normal person would be all over it. But he's not totally a normal person."

Nakamoto's middle brother, Tokuo Nakamoto, who lives near his brother and mother, in Duarte, Calif., agrees. "He is very meticulous in what he does, but he is very afraid to take himself out into the media, so you will have to excuse him," he says.

Characteristics of Satoshi Nakamoto, the Bitcoin founder, that dovetail with Dorian S. Nakamoto, the computer engineer, are numerous. Those working most closely with Bitcoin's founder noticed several things: he seemed to be older than the other Bitcoin developers. And he worked alone.

"He didn't seem like a young person and he seemed to be influenced by a lot of people in Silicon Valley," says Nakamoto's Finnish protégé, Martti Malmi. Andresen concurs: "Satoshi's style of writing code was old-school. He used things like reverse Polish notation."

"Everyone who looked at his code has pretty much concluded it was a single person," says Andresen. "We have rewritten roughly 70 percent of the code since inception. It wasn't written with nice interfaces. It was like one big hairball. It was incredibly tight and well-written at the lower level but where functions came together it could be pretty messy."

In his correspondences and writings, it has widely been noted that Satoshi Nakamoto alternates between British and American spellings - and, depending on his audience, veers between highly abbreviated verbiage and a more formal, polished style. Grace Mitchell says her husband does the same.

Dorian S. Nakamoto's use of English, she says, was likely influenced by his lifelong interest in collecting model trains, many of which he imported from England as a teenager while he was still learning English.

Mitchell suspects Nakamoto's initial interest in creating a digital currency that could be used anywhere in the world may have stemmed from his frustration with bank fees and high exchange rates when he was sending international wires to England to buy model trains. "He would always complain about that," she says. "I would not say he writes flawless English. He will pick up words and mix the spellings."

Eric, Nakamoto's oldest son from his first marriage, says he remains torn over whether his father is the founder of Bitcoin, noting that messages from the latter appear more "concise" and "refined than that of my father's."

Satoshi Nakamoto's three-year silence also dovetails with health issues suffered by Dorian S. Nakamoto in the past few years, his family says. "It has been hard, because he suffered a stroke several months ago and before that he was dealing with prostate cancer," says his wife, who works as a critical-care nurse in New Jersey. "He hasn't seen his kids for the past few years."

She has been unable to get Nakamoto to speak with her about whether he was the founder of Bitcoin. Eric Nakamoto says his father has denied it. Tokuo and Arthur Nakamoto believe their brother will leave the truth unconfirmed.

"Dorian can just be paranoid," says Tokuo. "I cannot get through to him. I don't think he will answer any of these questions to his family truthfully."

Andresen says if Nakamoto is as concerned about maintaining his anonymity as he remembers the answer might be simple: He does not want to participate in the Bitcoin madness. "If you come out as the leader of Bitcoin, now you have to make appearances and presentations and comments to the press and that didn't really fit with Satoshi's personality," he says. "He didn't really want to lead it anymore. He was pretty intolerant to incompetence. And he also realized the project would go on without him."

On the other hand, it is possible Nakamoto simply lost the private security keys to unlock his Bitcoin and cash in on his riches. Andresen, however, says he doubts it. "He was too disciplined," he says.

If Nakamoto ever sells his Bitcoin fortune, he would likely have to do so at a legitimate Bitcoin bank or exchange, which would not only give away his identity but alert everyone from the IRS to the FBI of his movements. While Bitcoin lets its users conduct transactions anonymously, all transactions can be viewed transparently online - and everyone is watching Nakamoto's Bitcoin to see if he spends it, says Andresen.

For his part, Andresen says he is inclined to respect Nakamoto's anonymity. "When programmers get together, we don't talk about who Satoshi Nakamoto is," he says. "We talk about how we should have invested in more Bitcoin. I mean, we're curious about it, but honestly, we really don't care."

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This article purported to identify the author of Bitcoin as an actual man in California named Dorian Satoshi Nakamoto. Written by Leah McGrath Goodman, the article was published on the cover of the reissued Newsweek.